If they say they use 100% beef then i'm sure it is the case. But as others said its not about the ingredients. The overall look is in my experience not attractive and neither is the taste. Cabbage is also a good ingredient but I neither like the look of it or the taste.
When i'm working i'll get lunch out all the time, this week has been mostly subway. Since i go in at a certain time the salad is always fresh looking and so the sub they make ends up looking a lot more appetizing than anything i've had in McD plus I don't feel hungry again after finishing. I'm not saying Subway food is any healthier as there are well known concerns with it.
If m having a burger when at work i go to GBK and use my Taste card (50% off the food). If i'm in town and i'm getting lunch it'll be Subway or BK for the "fast food" kind of places or one of the jacket spud type places if available.